Syslac Syrup

Reviewed By Dr. Rajeev Sharma, MBA, MBBS

Last updated on 04 Feb 2026 | 05:00 PM (IST)

Syslac Syrup is a type of sugar used to treat constipation. It is known as a laxative and makes your stool easier to pass by drawing water into your bowel. It is also used to treat hepatic encephalopathy (a liver disease causing confusion, tremor, decreased level of consciousness).

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Syslac 10gm Syrup

bottle of 200 ml Syrup

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General Information

Contains

Lactulose (10gm/15ml)

Marketer

Radius Drug Pvt Ltd

Storage

Store below 25°C

The content is shown in English

Product introduction

Syslac Syrup can be taken with or without food. You should take this medicine as advised by your doctor. Use this medicine regularly to get the maximum benefit and try to take it at the same time(s) each day. Your dose may go up or down depending on how well it is working. Do not take more than you are advised to and, if you miss a dose, do not take an extra one to make up for it. This medicine takes at least 48 hours to work. Talk to your doctor if you are still constipated after 3 days.

The most common side effects are nausea and vomiting. These are usually mild and go away after a couple of days. Occasionally people develop serious side effects including severe diarrhea and electrolyte imbalance. Talk to your doctor straight away if you notice any of these.

Before taking this medicine, you should tell your doctor if you have diabetes or if you are unable to digest milk sugar (lactose intolerant). If you use this medicine over a long period of time, your doctor may want you to have occasional blood tests to check the mineral levels (e.g. potassium and sodium). Do not take other laxative medicines while taking this medicine and check with your doctor if you are pregnant or breastfeeding.

Uses of Syslac Syrup

Constipation
Treatment of Hepatic encephalopathy

Benefits of Syslac Syrup

Constipation
Constipation occurs when bowel movements become less frequent and stools are hard to pass. Syslac Syrup helps soften the stool and increases bowel movement frequency by drawing water into the intestines. This provides gentle and effective relief from constipation and improves digestive comfort.

Treatment of Hepatic encephalopathy
Hepatic encephalopathy is a liver-related condition that affects brain function due to the buildup of toxins in the blood. Syslac Syrup helps remove these toxins, especially ammonia, through bowel movements. This helps improve mental clarity, reduces confusion, and supports better liver health and overall well-being.

Side effects of Syslac Syrup

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them

Common side effects of Syslac

Nausea
Flatulence
Abdominal pain
Diarrhea
Vomiting

How to use Syslac Syrup

Take this medicine in the dose and duration as advised by your doctor. Check the label for directions before use. Measure it with a measuring cup and take it by mouth. Shake well before use. Syslac Syrup may be taken with or without food.

How Syslac Syrup works

Syslac Syrup works by drawing water into the intestine through osmosis, which makes the stool soft and easier to pass.

Quick tips

Syslac Syrup should preferably be taken at bedtime as it requires 6 to 8 hours to show effect.
It is usually taken once a day as needed for up to 2 weeks. Take it exactly as prescribed by the doctor.
Take it atleast 2 hours after taking other medicines, as it may interfere with the absorption of other medicines.
Inform your doctor if you have a history of stomach disorders such as appendicitis or a blockage in your bowel.
Some healthy tips to prevent constipation from happening:
- Eat more fiber in your diet. Recommended daily intake is 20-35g
- Drink 8-10 glasses of water per day
- Exercise regularly at least 3 times per week
- Do not hold in stool as that can worsen bowel issues

Safety advice

Alcohol

CONSULT YOUR DOCTOR

It is not known whether it is safe to consume alcohol with Syslac Syrup. Please consult your doctor.

Pregnancy

CONSULT YOUR DOCTOR

The safety of Syslac Syrup during pregnancy has not been established. There are no adequate and well-controlled studies in pregnant women, and animal data on reproductive toxicity are insufficient. Your doctor will weigh the benefits and any potential risks before prescribing.

Breast feeding

CAUTION

Syslac Syrup should be used with caution during breastfeeding. Breastfeeding should be held until the treatment of the mother is completed and the drug is eliminated from the body.

Driving

SAFE

Syslac Syrup does not usually affect your ability to drive.

Kidney

CONSULT YOUR DOCTOR

There is limited data available on the use of Syslac Syrup in patients with kidney disease. Please consult your doctor.

Liver

SAFE IF PRESCRIBED

Syslac Syrup is safe to use in patients with liver disease. No dose adjustment is recommended.

Interaction with drugs

Taking Syslac with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Moderate

Acenocoumarol (Oral Route)

Inform your doctor if you notice any signs of bleeding (bruising, bleeding gums, blood in stool/vomit/urine). Lactulose may increase the effect of Acenocoumarol.

Moderate

Warfarin (Oral Route)

Inform your doctor if you notice any signs of bleeding (bruising, bleeding gums, blood in stool/vomit/urine). Lactulose may increase the effect of Warfarin.

Mild

Mesalazine (Oral Route)

Talk to your doctor if you notice any unusual symptoms.Doctor may monitor your blood sugar level. Lactulose may reduce blood levels and efficacy of the active form of Mesalazine.

Frequently asked questions

How should Syslac Syrup be taken?

You should take the prescribed amount in the measuring cup or spoon that is provided with the medicine. You can take it with water or fruit juice if you find it very sweet. Drink plenty of water for better results. Swallow it as soon as you keep it in mouth to prevent tooth decay which can occur if you take it for a longer time.

How long does it take for Syslac Syrup to work?

It takes about 2-3 days to see the benefits of the treatment. Talk to your doctor if you feel constipated even after 3 days of taking Syslac Syrup.

What is Syslac Syrup used for?

Syslac Syrup is used to treat constipation which is presented as infrequent bowel movements, hard and dry stools. It is also used in patients with hepatic encephalopathy which is a serious liver problem causing confusion, tremors and decreased level of consciousness.

Is Syslac Syrup a laxative?

Yes, Syslac Syrup is a laxative which softens the stools by pulling in water from the body to the large intestine. It is also used to reduce the amount of ammonia in the blood of patients with liver disease.

What are the side effects of taking Syslac Syrup?

Syslac Syrup very commonly causes diarrhea, flatulence, nausea, vomiting and abdominal pain. Diarrhea and abdominal pain occur due to a high dose. In such cases, the dose should be reduced. Flatulence may occur during the first few days of treatment and may disappear after sometime. This medicine may also cause electrolyte imbalance. However, this is an uncommon side effect.

Is it okay to take Syslac Syrup every day?

You should take Syslac Syrup for as long as advised by your doctor. You may also take it for as long as constipation lasts, which may be up to a week. For hepatic encephalopathy, the treatment may be longer, even several months.

Who should not be given Syslac Syrup?

Syslac Syrup should not be given to patients who are allergic to it or are intolerant to lactose (cannot process lactose). It should also be avoided in patients having galactosemia, a rare health problem where the body cannot process galactose.

Can I take other laxatives along with Syslac Syrup?

Usually, one laxative is sufficient to relieve constipation. In case you need more, your doctor may advise you to take one more laxative along with Syslac Syrup. The risk of side effects is more with two laxatives.

What if I take more than the recommended dose of Syslac Syrup?

Taking more than the recommended dose of Syslac Syrup may cause abdominal pain, electrolyte imbalance and diarrhea, which may last for a couple of days.

Fact Box

Chemical Class

O-glycosyl compounds

Habit Forming

Therapeutic Class

GASTRO INTESTINAL

Action Class

Osmotic Laxatives / Purgatives

Related lab tests

Ammonia

Liver Function Test

Potassium

Sodium

References

Sharkey KA, Wallace JL. Treatment of Disorders of Bowel Motility and Water Flux; Anti-Emetics; Agents Used in Biliary and Pancreatic Disease. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s: The Pharmacological Basis of Therapeutics. 12th ed. New York, New York: McGraw-Hill Medical; 2011. p. 1332.
McQuaid KR. Drugs Used in the Treatment of Gastrointestinal Diseases. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. p. 1079.
Lactulose. Maidenhead, Berkshire: Intrapharm Laboratories Limited; 2015 [revised 12 Jan. 2017]. [Accessed 27 Mar. 2019] (online) Available from:
Central Drugs Standard Control Organisation (CDSCO). [Accessed 27 Mar. 2019] (online) Available from:
Lactulose. Greenville, SC: PAI Pharma; 2025 [Accessed 04 Feb. 2026] (online). Available from:
Lactulose. Olst, The Netherlands: Abbott Biologicals B.V.; 2022 [Accessed 04 Feb. 2026] (online). Available from:

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Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Radius Drug Pvt Ltd
Address: P No - 1 A, No - 111, Kheora, Kachhar, Mainawati Marg, Kanpur Nagar, Kanpur Nagar, Uttar Pradesh, 208017

Vendor Details

Country of origin: India

Lab tests offered by us

Why we need a prescription?

Provide right medicines

Prescriptions are complex documents. We proof read and recheck at various steps to provide you the right medication in the correct form and dose

In accordance with the law

Most medicines cannot be sold without a valid prescription, as per the Drugs and Cosmetics Act, 1940 and Rules, 1945

Syslac Syrup

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General Information

Contains

Marketer

Storage

Product introduction

Uses of Syslac Syrup

Benefits of Syslac Syrup

Side effects of Syslac Syrup

How to use Syslac Syrup

How Syslac Syrup works

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Acenocoumarol (Oral Route)

Warfarin (Oral Route)

Mesalazine (Oral Route)

Frequently asked questions

How should Syslac Syrup be taken?

How long does it take for Syslac Syrup to work?

What is Syslac Syrup used for?

Is Syslac Syrup a laxative?

What are the side effects of taking Syslac Syrup?

Is it okay to take Syslac Syrup every day?

Who should not be given Syslac Syrup?

Can I take other laxatives along with Syslac Syrup?

What if I take more than the recommended dose of Syslac Syrup?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

Related lab tests

Ammonia

Liver Function Test

Potassium

Sodium

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

Related/Popular tests